I'm going to get a haircut - just a trim.
我打算去理发 - 只是修剪一下。

Vanessa had her hair done at the salon.
凡妮莎在发廊做的头发

Both men and women get 'haircuts', but only women have their 'hair done'.
男士和女士都会去”“剪头发”,但是只有女士会去”“做头发”。